We here can give you plenty of advice to start out with for multiple ways to make it to the 'big time'.
Be it with singing, mentors. agencies, studios, apprenticeships, performance groups, career suggestions, or even academics that can help build a portfolio of experience...
But it appears more of a social interaction issue, in conjunction with your own self confidence of what you can really do and have the interests or desires strong enough to accomplish what you really want, for now.
Realize it does take personal wisdom and fortitude to make the decisions necessary to get anything accomplished, in gear, and into regular practice. This is what is behind any motivation, creative properties and career paths or change in lifestyle anyone has to eventually make for themselves.
First know what your priorities really are. It may be the common sense at first, even survival and this is important enough to then having to support any 'dream' you may want to pursue in the meantime. If it is strong enough, it will come soon enough, during your course of action and while you find a workable blend of that ability and having the practical skills for living as you want to.
Just try, and get into it, no matter at what level you can then handle and go from there.
p.s.: If you are serious about voice, get into recording and playback (even pay for a studio session as an extreme) to build some reference and self training for now. It certainly helps to know what you really sound like and what can be improved upon before going 'live' for any other ears. A beginning at least, and truth in such reality.
Learn to take any criticism as constructive advice, and not having to take it as an offense of your person or who you are, but as an artist willing to learn more of their abilities and willing to work on them for the better. Be grateful for that, and even any failures that can become real lessons for expereince. Be patient.
46 years guitar and keyboard player (retired commercial and graphic artist, writer, widower, woodworker, animal lover and good barbeque cook) been around some (with a small home recording studio)